Sulphide scales are an ever increasing challenge in the oil and gas production, with some more challenging than others to mitigate with chemicals. In addition, removal of sulphide scales can be extremely difficult, and as such there is a real need for industry focus for new understanding and technologies in this area. It is recognised that there is a knowledge gap in comparison to the more conventional scales, in the understanding of the scale formation, deposition and mitigation aspects. This session explores advancements made in the understanding of sulphide scale precipitation, deposition and mitigation, as well as chemical development methods, and the effect of testing in multiphase conditions and the potential of surface coatings in combating adhesion of scale.

In addition to the papers which are presented at the conference, a number of additional papers are available and will be presented in poster format.
These technical poster cover a wide range of topics and represent multiple demographic areas. Poster presenters will be available for questions and discussion at their designated session, spread over the coffee breaks.
We hope you enjoy this additional opportunity for learning.

In addition to the papers which are presented at the conference, a number of additional papers are available and will be presented in poster format.
These technical poster cover a wide range of topics and represent multiple demographic areas. Poster presenters will be available for questions and discussion at their designated session, spread over the coffee breaks.
We hope you enjoy this additional opportunity for learning.

This session recognises the ongoing scale inhibition challenges faced by production chemists and a desire to investigate new solutions to existing scale problems. Papers presented relate to a new test method and its applicability to specific field applications, performance of a new molecule to prevent calcium carbonate/sulphate scale whilst meeting environmental compliance (OECD306) and the evaluation, including field trial, of iron tolerance for a scale inhibitor used in conventional production and also fracturing completions.

This session gives an insight into the recent developments within scale predictions. Scale predictions are important tools to more accurately evaluate the scaling risk, design scale inhibitor treatments, and predict fresh water breakthrough. It is an essential tool to handle scale issues in increasingly harsher environments, such as ultra-high temperature, pressure and complex ion conditions. Challenges associated with the impact of very high calcium concentrations on sulphate scale predictions at high temperature is one of the focuses of this session; in addition, there will be an interesting presentation regarding the kinetic effects into the thermodynamic modelling of CaCO3 scale.

To prevent scale formation and deposition in oil fields reliably and cost efficiently, it is imperative to know the correct water chemistry throughout the production system and the level of protection provided by scale inhibitors used in scale inhibitor squeeze treatments. This session addresses these issues by presenting improved as well as new methods for analysing scale inhibitors returning from scale inhibitor treatments more accurately, a new methodology for determining formation water compositions contaminated with drilling mud filtrate and a review of sample preservation techniques.

unconventional onshore hydrocarbon wells. Silicates as scaling species have entered our perception through enhanced oil recovery techniques, such as alkaline as well as steam flooding. With our awareness raised, both scale types are identified as flow assurance challenges that require effective control options.
This session will contain presentations on practical experiences, and laboratory testing of chemicals as well as some fundamental insights into the formation/control of exotic scales. There will be operational case studies on inhibitor applications, as well as new laboratory methodologies to evaluate scale inhibition and understand the scaling process for those unconventional scales.

In this session, a broad range of scale management topics will be presented. The first covers the laboratory work undertaken to qualify a scale inhibitor to prevent scale formation when an operator had to change from low sulphate seawater (LSSW) mixed with produced water (PW) for injection source to a blend of LSSW/PW and seawater (SW). The second summarises an operator's successful efforts to produce more water from their sulphate-reduction units, whilst optimising the quantity and type of scale inhibitors used (with a priority given to green chemicals). Finally, a comprehensive review of non-chemical methods for downhole scale control will be presented, including how they can minimise or alleviate the need for downhole chemical treatments.

Time

Paper #

Presentation

1100-1130

190713

Management of Scale Control in Produced Water Reinjection - The Near Wellbore Scale Challenge OvercomeM.M. Jordan, Nalco Champion, An Ecolab Company

Numerical simulation approaches have been widely used in various processes of the scale control management. In this session, three papers representing the recent technology development in this area cover three different processes as follows:
(i) Effect of Squeeze Treatment Stages Mixing during Injection on Lifetime
(ii) Simulating Squeeze Treatments in Wells Completed with Inflow Control Devices
(iii) Impact of Polymer EOR and Salinity on Barium Sulphate Scale Risk
On two alternate presenting papers, one presents scale inhibitor squeeze treatment simulation with tracer programme design and another shows a simulation study for scale management during shale gas production.

In this session the kinetics of dissolution and precipitation of calcium carbonate in MEG systems are investigated, particularly the determination of crystal growth and agglomeration rates of carbonates in different compositions of the MEG/water mixture. The topic of extending the squeeze life time is presented, the strategy for improvement of adsorption of scale inhibitors onto the carbonate rock is presented. Interactions between scale inhibitors are examined. Water injection is commonly used in oil fields for pressure support and productivity enhancement. The traditional thermodynamics approach for scale prediction only provides precipitation potential at different mixing ratios. In this session a reservoir reactive transport modelling of carbonate reservoir that predicts better the time-dependent mineral scales formation is presented.